Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05f2a37950d2bec…

MALICIOUS

PDF

99.7 KB Created: 2021-10-14 07:56:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 039994ff7e6fba3eadd2f277e2bb3611 SHA-1: bc553bb27e63e7592599c7955ce6cf0d7cb45eac SHA-256: c05f2a37950d2becfa6b816332d226745d0d34dd0088d6437395e185b9f3bc73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains numerous embedded URLs pointing to various domains, many of which appear to be part of a link farm designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports the phishing lure hypothesis, indicating a large number of links on disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9922

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://medvor.ru/uplcv?utm_term=pokemon+3ds+download PDF link annotation
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16161bcc85c139---netevogekelepatodanefam.pdfIn PDF document text
    • http://ldkxzzs.com/images/userfiles/file/kodibezutafavibatog.pdfIn PDF document text
    • http://rjbmachinery.com/d/files/jimijuwesiveximevupuf.pdfIn PDF document text
    • http://aaronandanthony.com/userfiles/files/1765098993.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/perofabexewoxamimesevuzu.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/4p22u21mson0a3piulm1jibltj/woxazi.pdfIn PDF document text
    • http://www.cda.org.hk/ckfinder/userfiles/files/81242714095.pdfIn PDF document text
    • https://renewone.de/files/dofaruzoworaripozi.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/tetapojafix.pdfIn PDF document text
    • https://butchercurnow.com/img/shop/contents/wurukodixidekuruwuv.pdfIn PDF document text
    • http://idominjazz.com/fckeditor/userfiles/image/46213476117.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/mapadazamebigemeweb.pdfIn PDF document text
    • https://fotobolfestmeny.hu/mvc/userfiles/file/fovuberuganizesoxa.pdfIn PDF document text
    • https://maria-galland.ru/files/file/sibapipewolofurinir.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/57894009063.pdfIn PDF document text
    • https://wspaperbag.com/userfiles/file/vuden.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/91492270716.pdfIn PDF document text
    • https://alibrahimtravel.com/mycms/uploadedimages/editorUploadedImages/file/jibafojaxexojofi.pdfIn PDF document text
    • http://husplaza.hu/editor_up/27114466865.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/dapesu.pdfIn PDF document text
    • http://smart-ventures.ch/upload/Editor_Images/files/dojawopabibenot.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/42597476152.pdfIn PDF document text
    • https://pierrelemagicien.com/userfiles/file/senovebamobeni.pdfIn PDF document text
    • http://eg-connect.com/uploads/editorfiles/file///7622866925.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/dabejugizegu.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011faa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FAA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000137c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C1 10472 bytes
SHA-256: 1c74714465c67887ecfe222383965f2bc8562c6e54b4341dfbdc0fa60a1f943b
font_02_sfnt_off00014fa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FA4 19400 bytes
SHA-256: 5850984e8a1daa4d462f7efc3847e3508cc07c6968808d176efb1efaaad4abc8